Sure, anna. Do you know how to highlight, copy and paste? If you do, then you just open two windows (CAF and YouTube). On YouTube,you can search for the video you want and then highlight (by moving your mouse over it, it’ll be blue) and then right click with your mouse to “copy” the link which you then move to your post on CAF.
Once you are on your post page, you “paste” the link into the post and if your preview is showing, you’ll see the link which will then turn into a clip of the song.
If you just use a search engine for the video you want, the YouTube link is usually directly under and you highlight and copy that and bring it to your post on CAF and then paste it into the post.
If you don’t know how to copy and paste, PM me and I’ll give you the link to the site I learned it from.